Metal-catcher for grinders.



F. WILLIAMS. METAL CATCHE R FOR GRINDE'RS. APPLICATION HL'ED JUNE 10. lQI B. I

I 1,278,542. v PatentedSept.- 10, 1918.

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UNITED STATES PATENToFFIc uIL'ron n wxmimms, on ST. LOUIS, MISSOURI; sssrewon '10 WILLIAMS 1 4mm cnusnnn AND PULvEnIzEn so, 01 ST. LOUIS, mssoum, A oom'ommon or MISSOURI.

Speciflcationot Letters Patent.

METAL-CATCHER FOR GRINDERS.

matted Sept; '10, 1918.

Application fll'ed June 10, 1918. Serial No. 259,292.

To all whom it may concern:

Be it known that l, MILTON F. VILLIJMS, a citizen of the United States, residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in Metal'Catchers for Grinders, of which the followii'lg is a specification.-

This invention relates to certain new and useful improvements in metal catchers for grinders and like machines, the peculiarities of which will be hereinafter described and claimed.

The main object of my invention is to provide means for catching metal, gravel and other relatively heavy extraneous matter generally contained in feed supplied to grinders, pulverizers and like machines, and to clear the catcher of the partly ground or light material some of which is also thrown into the catcher by the hammers of the grinder.

In the accompanying drawing on which like reference letters indicate corresponding parts, Figure 1 represents a vertical transverse section of part) of a grinder pro vided with my improved catcher; and Fig. 2 a detail side view and partial section of my metal catcher detached,

A designates the shaft of a grinder of the class described on which are secured disks B supporting hammer rods C on which are .pivoted rotary hammers D, operating in the direction of the arrow past the breaker plate E and cage F. G is a supply hopper located above the rotary hammers on a cover I l. provided. with a vertical wall I substan tially over the axis of said shaft. A hopper inlet J through the cover is provided "with a downwardly inclined slide valve K mounted in suitable grooves in the sides of said in let, and with its lower inner end Z1 normally adjacent to'the said wall I, so as to deliver the feed ina vertically radial stream practically over the, center of the shaft, and close to the path of the ends of the hammer.

In the cover casing below the feed slide,

and opposite the central wall I, is an opening L that is substantially the width of they casing and has an inclined bottom M; preferably arallcl to said slide and with its inner e ge N located on the same level as, or alittle below, the lower edge 2' of said central wall I, and: likewise of the path of the hammers as they pass said edge L; that is to say, this outlet opening is subs antially tangential to the path of the ends of the harhnor as they pass the feed inlet. The upper edge of said breaker plate and its supporting slide (J, is directly adjacent-t0 said edge and forms an acute angle with the bottom M, so that. feed and other matter driyenby said hammers out of said opening L will bef directed into a box or receptacle adapted to form a closed chamber. This arrangement of the grinder is similar to that shown 'in \Villiams prior Patent No. 1,235,868. In the present case however a box of different style adapted to prevent accumulation of light material in the reserved for the foreign n'iaterial,'is shown and described This box has an opening at one side, practically the width of the casing and matching said opening L.- The bottom P of said box is preferably inclined and forms an acute angle with the opposite side wall Q by which a converging tapering pocket is formed below the bottom M of saidopening L. This bottom is preferably hinged at R by its upper edge to the lower edge of one side, and the lower edge 7') is adjustable to and from the wall Q, to form a variable width of air opening,=preferably by means of a thread ed bolt S passing through said bottomand having a nut. on each side by which the width of the opening is regulated. A long narrow air inletis thus available at the very bottom of said pocket, and the air suction caused by the rotating hammers, or other.

means, will draw the air through this regulated inlet and the material deposited in the pocket, thereby separating from the heavy particles. the lighter portion of feed that may be driven by the hammers into the box..

A wall T opposite the opening L, is nearly normal to the path of the particles driven into said box, and if anythinginclined up the deposited material.

The box is closed, except for the opening in the side that matches the outlet opening in the side ofthe grinder, and except also for the variable size'd air inlet slit -at.the ve bottom of the tapering pocket, by

which air inlet the proper quantity of air to clear the pocket of said i-iht particles is admitted in a thin stream he Whole width of the box as required. The heavy extraneous particles, thus freed from light particles, collect in the bottom of the pocket and I I are removed occasionally as they accumulate,

. The combination with by releasing said inclined bottom. While I am aware that it is not new to provide an opening in the side Wall of a rotary beater easing below a feed inlet and tangential to the path of the heaters, yet the provision of a closed .box except for the openings as above'described, and as shown on the drawings, is believed to be new in the art to which this application pertains.

I claim:

machine of the character described comprising rotary beat- I eI's and a caslng having a top feed hopper with aslant bottom, and having an adjacent outlet beyond and guarded by said slant bottom from ravitating feed, of a box ha.v"

ing in its ront Wall an opening matching sa1d outlet, and comprising top, back, end walls, and a downwardly inclined bottom, said bottom being hinged at the top to said back, and havin its lower edge adjustable to and from -saic front Wall, and means to secure said bottom in any varied opening at said lower edge, substantially as described.

In testimony whereof I have afiixed my signature.

MILTON F. WILLIAMS. 

